Wikipedia's entry for 'Mass Hysteria' now refers to something called 'Conversion disorder', which seems to be the current term for this kind of behaviour where a more or less isolated group of people get themselves worked up: "Conversion disorder is where patients suffer apparently neurological symptoms, such as numbness, blindness, paralysis, or fits, but without a neurological cause. It is thought that these problems arise in response to difficulties in the patient's life, and conversion is considered a psychiatric disorder in the Diagnostic and Statistical Manual of Mental Disorders fourth edition (DSM-IV).[1]"
http://en.wikipedia.org/wiki/Conversion_disorder
I'm just making the point that Portsea Island is a small and isolated community where the truth seems to be what they want it to be